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Bias tape maker
Small tool that folds a strip of bias-cut fabric into even single- or double-fold tape as it is pressed, speeding up preparation of binding for edges and facings.
beginner · Edges & facings
Bias-bound neckline
A neckline finished by binding the raw edge with a bias strip instead of a separate facing, giving a narrow, clean edge.
beginner · Collars & necklines
Bicep adjustment
A pattern alteration that adds or removes width in the upper sleeve to match an arm circumference that differs from the block's assumed bicep measurement.
intermediate · Fit adjustments
Bicep circumference
The measurement taken around the fullest part of the upper arm, used to check and adjust the fit of a sleeve pattern.
intermediate · Measurement terms
Bicep measurement
The circumference of the upper arm at its fullest point, used to ensure adequate width across the sleeve cap and upper sleeve of a garment.
beginner · Measuring
Big 4
A nickname for the four long-established American pattern companies: Butterick, McCall's, Simplicity, and Vogue Patterns.
beginner · Community slang & abbreviations
Big Four pattern companies
A collective term for the four major North American commercial pattern publishers—Simplicity, McCall's, Butterick, and Vogue—known for tissue-paper multi-size patterns sold in retail envelopes.
beginner · Pattern formats & sources
Bikini
A two-piece swimsuit consisting of a separate top and bottom that expose the midriff, typically constructed from stretch swim fabric.
intermediate · Lingerie & swimwear
Bishop sleeve
A long sleeve that is full through the forearm and gathered into a fitted cuff at the wrist, historically associated with clerical and Victorian dress.
advanced · Sleeve types
Blanket stitch
A looped edge stitch that wraps around a raw or folded edge, used to finish edges or attach appliqué.
intermediate · Hand sewing
Blazer
A tailored jacket, single- or double-breasted, structured with shoulder padding and often lapels, worn as smart separates rather than part of a matched suit.
advanced · Outerwear & tailoring
Blind hem
A hem stitched so the stitching is nearly invisible from the right side, worked by hand with a blind hemming stitch or by machine with a blind hem foot.
intermediate · Hems
Blind hem foot
A presser foot with a guide bar that runs along a folded hem edge, positioning the needle to catch only a thread or two for an invisible hem.
intermediate · Presser feet
Blind hem stitch
A stitch pattern combining several straight stitches with a single zigzag jog, used with a folded hem to catch fabric almost invisibly from the right side.
intermediate · Stitches & settings
Block
A basic pattern shape, drafted to fit a specific set of body measurements without seam allowances or design details, used as the foundation for other patterns; called a sloper in American usage.
advanced · Pattern terms
Block fusing
Fusing interfacing to a large piece of fabric before the pattern pieces are cut from it, ensuring even stability and grain alignment across every piece.
intermediate · Pressing
Block printing (textile)
Hand-printing technique in which a carved wooden or linoleum block is inked or dyed and pressed onto fabric to transfer a repeating design.
intermediate · Dyeing & printing
Blocking (fabric)
Dampening or steaming a piece, especially a knit, and pinning it to dry in a set shape and dimension to correct distortion before or after construction.
advanced · Care & preparation
Bloomers
Loose trousers gathered at the ankle, worn under a shorter skirt and popularized by Amelia Bloomer in the 1850s as a practical, controversial alternative to restrictive Victorian dress.
intermediate · Historical garments & silhouettes
Blouse
A loose-fitting upper-body garment for women, traditionally softer and more decorative than a tailored shirt, often gathered or finished at the waist or hip.
beginner · Tops & shirts
Boat neck
A wide, shallow neckline that runs nearly horizontally from shoulder to shoulder, closely following the collarbone.
beginner · Neckline & collar types
Bobbin
A small spool that holds the lower thread supply, fitting into the bobbin case beneath the needle plate to form the underside of a lockstitch.
beginner · Machine anatomy
Bobbin case
A metal or plastic holder that houses the bobbin and regulates lower-thread tension via an adjustable spring before the thread reaches the needle plate.
beginner · Machine anatomy
Bobbin case tension screw loose
Bobbin thread that pulls with no resistance, causing loopy stitches, usually means the small screw on the bobbin case has loosened. Turn it slightly clockwise and test on scrap before sewing the garment.
advanced · Machine problems
Bobbin tension adjustment
Fine-tuning the small screw on the bobbin case that controls how much resistance the lower thread meets, used to correct or balance stitch formation.
intermediate · Maintenance & troubleshooting
Bobbin thread showing on top
Dots of bobbin-colored thread on the fabric's right side mean top tension is too tight relative to the bobbin, pulling bobbin thread up through the fabric. Loosen the top tension and test on a scrap.
beginner · Stitch & thread problems
Bobbin winder
A spindle and motor mechanism on a sewing machine that winds thread evenly onto an empty bobbin, usually engaged by disengaging the main stitching mechanism.
beginner · Machine anatomy
Bodice block
A basic sloper covering the torso from shoulder to waist, fitted with darts to the bust and waist, used as the foundation for drafting bodices, tops, and dresses.
intermediate · Pattern blocks
Bodice draft
The process of constructing a fitted torso pattern from a set of body measurements using drafting formulas and a straightedge, producing front and back pieces shaped with darts.
intermediate · Drafting bodices
Bodice to dress hack
A pattern hacking technique that extends a bodice pattern's hemline and adjusts its shaping to convert a top pattern into a full dress pattern.
intermediate · Pattern hacking
Body measurements
The set of measurements taken directly from a person's body, such as bust, waist, and hip circumference, used to choose or draft a pattern size.
beginner · Measurement terms
Boiled wool
A knitted or woven wool fabric that has been felted through heat, moisture and agitation, producing a dense, non-fraying fabric that needs no seam finishing.
advanced · Knit fabrics
Boilersuit
A one-piece garment combining a jacket and trousers into a single front-zippered or buttoned suit, designed to protect the wearer's clothing during manual work.
intermediate · Jeans & workwear
Bolt
A large roll of fabric as sold in a shop, wound around a flat cardboard or plastic core and holding many yards of material.
beginner · Fabric & grain terms
Bomber jacket
A short jacket with a fitted, ribbed waistband and cuffs, a front zipper closure, and a rounded collar, originating from military flight wear.
intermediate · Outerwear & tailoring
Boning
Rigid or semi-rigid strips, historically whalebone and now plastic or steel, inserted into channels within a bodice to maintain a fitted, structured shape.
advanced · Couture
Boning (corsetry)
Rigid or semi-rigid strips, of steel, plastic or historically whalebone, inserted into channels to shape and support structured garments such as corsets and strapless bodices.
advanced · Fastenings & hardware
Boro (textile)
A Japanese tradition of patching and mending indigo cotton textiles with layered scraps, born of necessity among rural families from the Edo period into the 20th century and later admired as folk art.
advanced · World sewing traditions
Bound buttonhole
A buttonhole finished with folded fabric strips, or lips, instead of thread, giving a tailored, couture-quality opening usually made before the garment is fully assembled.
advanced · Closures
Bound seam finish
A finish in which a folded binding strip encases the raw edge of a seam allowance, stitched through all layers; used when a seam will remain unlined and visible.
intermediate · Seam finishes